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nhà máy thủy điện là nơi chuyển đổi sức nước thành điện năng. nước được tụ lại tại các đập nước với một thế năng lớn . Qua một hệ thống ống dẫn , năng lượng dòng chảy của nước được truyền tới tuabin nước , tuabin nước được nối với máy phát điện , nơi chúng được chuyển thành năng lượng điện . A) động năng làm quay tuabin nước được chuyển hóa từ dạng cơ năng nào của dòng nước b) Thủy điện đóng vai trò quan trọng trong việc cung cấp năng lượng tuy nhiên thủy điện vẫn còn nhiều hạn chế , em hãy nêu những hạn chế đó
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#Mấy anh chị giỏi Anh giúp em : Question I: Choose the word that has the underlined part pronounced different from the other (1pt) 1. A. accept B. activity C. across D. afraid 2. A. boat B. cow C. grocer D. grow 3. A. display B. drive C. exciting D. idea 4. A. amusing B. cousin C. homesick D. season Question II: Choose the best answer (2pts) 1. The ao dai is usually made of a light................. A. cotton B. design C. symbol D. material 2. They................. in Hue................. a long time. A. were living/ for B. were living/ since C. have lived/ for D. have lived/ since 3. These plants .................................. for animals' food. A. can grow B. can be grown C. have grown D. grow 4. Japanese people usually wear kimonos on special ......................... A. occasions B. times C. situations D. places 5. He used to ...................................................... to school by his mother. A. take B. taking C. taken D. be taken 6. They wish they .............................. a new house now. A. have B. had C. will have D. would have 7. It rains heavily, ........................................ I can't go to the movies with you. A. and B. but C. because D. so 8. He asked me where I ................................ the next day. A. go B. went C. will go D. would go Question III: Using the correct tense of the verbs to complete the sentences. (2 pts) 1. Lan (eat)..............................................................dinner when his friend called. 2. She rarely (get) ............................................. home before six o'clock. 3. We (not/ begin) ............................... to study for the test yet. 4. They (see) .................................................................. this movie before. 5. My friend is a writer. She (write) .............................................. many books. Question IV: Use the words given to fill in the blanks. There is one extra word that you do not need to use (2 pts) down – air – quickly – about – save - dirty – important – pollute – grow We all are destroying the Earth. The seas and rivers are too (1) .......................... to swim in. There is so much smoke in the (2) ................................ that it is unhealthy to live in many of the world's cities. In one well-known city, for example, poisonous gases from car (3) ............................. the air so much that policemen have to wear oxygen masks. We have cut (4)......................... so many trees that there are now vast areas of wasteland all over the world. As a result, farmers in parts of Africa can not (5) ......................... enough to eat. In certain countries in Asia there is so little rice. Moreover, we do not take enough care of the countryside. Wild animals are (6) ............................. disappearing. For instance, tigers are rare in India now. Because we have killed too many for them to survive. However, it is not so simple to talk (7) .............................. the problem. We must act now before it is too late to do anything about it. Join us now. (8) ..................the Earth. Question V: Rewrite each sentence, beginning as shown (2 pts) 1. He can't pass the examination. -> He wishes ........................................................................... 2. She asked me "Where do you live?" -> She asked me ........................................................................ 3. Mai has lived in Hanoi since she was 10. -> He started ........................................................................... 4. They can't speak English fluently. -> They wish ....................................................................................... Question VI. Read the passage, and decide whether the statements that follow are True or False: (1pt) Everybody knows that in studying foreign languages practice is the key to fluency. All foreign language learners even the advanced learners need practice. There is a fact that a learner can know a lot of grammar rules and have a large vocabulary; however, they can't speak well yet. So the learners must know how to use what they have learnt, apart from the ability to explain grammar rules. Listening, speaking, reading and writing are all important skills but most English learners find listening and writing the most difficult. 1. The key to fluency in studying a foreign language is practice. 1............ 2. Advanced learners needn't practice. 2............ 3. Some English learners find listening and writing the most difficult skills. 3............ 4. A learner can't speak well even though he knows a lot of grammar rules and has a large vocabulary. 4............

#mấy anh chị giỏi anh giúp em vs : ( Khó và dài lắm nhé , làm đc thì làm hết giúp em nhé ) I. Choose the best answer. 1. Vietnamese people are very _________________ and hospitable. A . reserved B. friendly C. official D. quiet 2. We can learn how ______ banh chung at Tet. A. To make B. Made C. Making D. Make 3. Ho Chi Minh City has been divided into twenty-four ___________ divisions since December 2003. A. Administrative B. Administration C. Administrator D. Administer 4. Public suggest that the factories_____________ with waste treatment system. A. Should equip B. Would be equiped C. Equiped D. Would equip 5. Nam didn’t know…………….to find more information the course. A. What B. Where C. why D. while 6. The farmers in my home village ______ rice home on trucks. They used buffalo-driven carts. A. didn’t used to transport B. Didn’t used transport C. didn’t use to transport D. used to transport 7. The Imperial Citadel of Thang Long is a _______ that consists of royal palaces and monuments. A. Structure B. Fortress C. Complex D. limestone 8. At night they used to entertain ______ by telling and acting out stories. A. Themselves B. Them C. Their D. Themself 9. It ………………….that They are quieter and cheaper than taxi. A. said B. Are said C. Is said D. Say 10. The children in my home village used to go _____, even in winter. Now they all have shoes. A. Bare-footed B. Played around C. Playing around D. On foot 11. Mary asked me Where I…………………from A. Coming B. come C. To come D. came 12. I wish people in the world ______ conflicts and lived in peace. A. Don’t have B. Didn’t have C. Didn’t had D. Doesn’t have 13. In Viet Nam, ______ often refers to age and social position, not to wealth. A. Culture B. Seniority C. Generation D. Tradition 14. Tom ‘’Thanks for the nice gift’ Daisy A. I am glad you like it B. You are welcome C. I myself don’t like it D. I’m happy 15. A ______ is used to make the sound much louder so that many people can hear it from a distance. A. Radio B. Computer C. Loudspeaker D. Television 16. Traditional craft has …………………….from generation to generation A. Passed B. passed down C. pass D. Been passed down 17. My mother doesn’t work ………………….. Saturday A. On B. in C. At D. for 18. It is ……………Ha long bay was recognized as a word Heritage site by UNESCO A. Knew B. To know C. known D. knowing II . Choose the word whose underline part is pronounced differently from the others. 19. A. measure B. conduct C. stuck D. frustrated 20. A. impolite B. night C. tradition D. slight III . Choose a word in each line that has different stress pattern. 21. A. people B. enough C. picture D. father 22. A. depend B. begin C. agree D. happen IV. Read the passage, and choose the best answer. Good manners are a treasure to the people who possess them, as well as to the community they live in. Manners are taught, learnt, and passed from generation to generation. Even hundreds of years ago, children were taught to behave responsibly. They learnt to respect seniority. When they passed an object to another person, they had to use both hands. When they entered a room, they had to bow and greet the oldest person first. Boys learnt to work hard to support their families. Girls learnt to do housework, and to take care of others. Loyalty and honesty were highly appreciated. When they made a mistake, they would not let another person be punished for it. That would be cowardly and mean. They were taught that families were strong, and everybody should stick together in adversity.(tai họa, nghịch cảnh) Fortunately, many of these values have been well preserved. They have contributed to making the unique Vietnamese culture, and strengthening our society. 23. Good manners are _______________________. A. of great value B. of the community C. traditional D. only for the old 24. What was a boy’s main duty? A. to respect seniority B. to support his family C. to do housework D. to share good things 25. The sentence: “When they made a mistake, they would not let another person be punished for it,” means they would _______________________. A. deny their mistake B. admit their mistake C. keep it a secret D. be punished 26. What contributed to making the unique Vietnamese culture? A. tradition B. generations C. good manners D. seniority 27. This passage is about_______________________. A. people who possess good manners B. what bad manners children in the past had C. the preservation of bad values D. good manners and their value

câu 1: Người ta thả một vật rơi từ đọ cao nào đó cách mặt đất. Hãy cho biết: -Trong thời gian vật rơi, thế năng và động của vật thay đổi như thế nào ? -Khi vật chạm đất, thế năng và động năng của vật thay đổi như thế nào ? . . Câu 2:Phân tích sự chuyển hóa giữa các dạng cơ năng khi: Một người nằm trên võng đu đưa. Võng chuyển động từ vị trí biên bên này sang vị trí biên bên kia ? . . Câu 3:Hãy phân tích sự chuyển hóa cơ năng của con lắc trong một dao động ? Tại sao con lắc không dao động được mãi mãi ? (vẽ hình) . . câu 4: cơ năng của từng vật trong các trường hợp sau thuộc dạng cơ năng nào ? a) xe ô đang chạy xuống dốc b) bóng đèn treo trên trần nhà c) quả bóng lăn trên sân d) cái bàn để trên mặt đất . . câu 5: một chiếc xe đang chuyển động lên dốc, một chiếc xe đang chuyển động trên mặt đường nằm ngang (vẽ hình các lực tác dụng lên xe).Cho biết lực nào sinh công ? vì sao?

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